Please read your Bible. The Revelation verses do not refer to a mask over the nose and mouth. It explains that 666 will be on the right hand or the forehead.
"Also it causes all, both small and great, both rich and poor, both free and slave,5 to be marked on the right hand or the forehead, 17 so that no one can buy or sell unless he has the mark, that is, rthe name of the beast or sthe number of its name. 18 tThis calls for wisdom: let the one who has understanding calculate the number of the beast, for it is the number uof a man, and his number is 666.6
